[[PHPhotoLibrary sharedPhotoLibrary] presentLimitedLibraryPickerFromViewController:self];弹出照片选择器时，导航栏背景颜色和导航栏字体颜色均为白色，导致无法辨认。
使用
[[UINavigationBar appearanceWhenContainedInInstancesOfClasses:@[UIImagePickerController.class]] setTintColor:[UIColor blackColor]];没有作用
doubleYao
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